Office (OOXML) / .XLSX malware analysis — malicious · 433157ed567acf6e

MALICIOUS

Office (OOXML) / .XLSX

60.9 KB Created: 2021-03-14 19:50:37 UTC Authoring application: Microsoft Excel 16.0300

MD5: fea55ad0c3ce9f252cbafd6e74b4d178 SHA-1: 03388385efd77d4bb11fdde2c390e2c83331f6ba SHA-256: 433157ed567acf6e78c536d6dab49c5409e65900e528c2cd4731240ad420891d

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The file is an Excel 4.0 macro sheet, indicated by the OOXML_XLM_MACROSHEET heuristic. While the macro content is truncated and heavily obfuscated, the presence of Excel 4.0 macros strongly suggests an attempt to execute arbitrary commands for payload delivery. Without further deobfuscation or network indicators, the specific family and full attack chain remain unclear.

Heuristics 1

Excel 4.0 macro sheet (1 sheet(s)) critical OOXML_XLM_MACROSHEET

Spreadsheet contains an Excel 4.0 (XLM) macro sheet — XLM was a major Office malware vector during 2020-2022 and evaded many VBA-focused controls before Microsoft tightened XLM defaults. Even legitimate XLM use is rare in modern workbooks. The macro sheet is stored as XLSB/BIFF12 binary content, which many XML-only OOXML scanners miss.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_sheet_00.bin` `b2408d0b6c593d5edd3aaf5ea23f0796ace10bfc1a0a7658009a14a543f61ffe`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	97004 bytes

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